2261
NGC 2261 is Hubble's Variable Nebula.
- Odd
- Composite
Where 2261 fits
Why 2261 is special
It visibly changes shape over weeks, because clouds near the illuminating star cast moving shadows across the nebula.
Factors & digit properties
- Divisors (8)
- 1, 7, 17, 19, 119, 133, 323, 2261
- Prime factorisation
- 7 × 17 × 19
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 2261
- Binary
- 100011010101
- Octal
- 4325
- Hexadecimal
- 8d5
- Roman numeral
- MMCCLXI
- Scientific notation
- 2.261 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Both lie in Monoceros, and one changes visible shape within weeks as shadows move across it.
View 2264 →Other connections
- is associated with2264
why?
Strength 0.50, confidence "high".
Science
NGC 2261 is a reflection nebula illuminated by the variable star R Monocerotis. Obscuring material near the star casts shifting shadows, changing the nebula's appearance on timescales of weeks.
DocumentedSciencePeriod: 1783–
Common questions
Is 2261 a prime number?
No, 2261 is not prime.
What are the factors of 2261?
The factors of 2261 are 1, 7, 17, 19, 119, 133, 323, 2261.
What is 2261 in Roman numerals?
2261 in Roman numerals is MMCCLXI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026